1. Neutral; indifferent; not engaged on either side; not participating with or aiding any of two or more opposing parties. The heart is incapable of being neutral, and it is continuously involved in one way or another. (Shaftesbury)
2. Neither good nor terrible; of average quality; indecisive or pronounced. Some things appear to be nice, while others appear to be bad, and some appear to be neutral in her amazing sight. Sir J. Davies (Sir J. Davies)
3. (science: biology) A Neuter is a word that means “nothing.”
4. (Science: chemistry) Certain salts or other substances are described as having neither acid nor basic characteristics; they are unable to make red litmus blue or blue litmus red. Acid and alkaline are contrasted.
5. (Chemical science) A salt produced by completely replacing the hydrogen in an acid or base with a positive or basic, or a negative or acidic, element or radical; in the former instance, by a positive or basic, in the latter case, by a negative or acid.
In watercolours, a neutral tint is a bluish grey pigment created by combining indigo or another blue with a warm colour. The hues are quite varied. The vowel element of a neutral vowel has an ambiguous and indeterminate character, similar to that of the vowel in many unaccented syllables. Some consider it to be the same as the u in up, and it’s also known as the natural vowel since it’s unformed by art or effort.